<template>
	<view v-if="goods_info.goods_name" class="goods-detail-container">
		<!-- 轮播图区域 -->
		<swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
			<swiper-item v-for="(item,index) in goods_info.pics" :key="index">
				<!-- 把当前点击的图片索引，传递到 preview() 处理函数中 -->
				<image :src="item.pics_big" @click="preview(index)"></image>
			</swiper-item>
		</swiper>
		
		<!-- 商品信息区域 -->
		<view class="goods-info-box">
			<!-- 商品价格 -->
			<view class="price">￥{{goods_info.goods_price}}</view>
			<!-- 信息主体区域 -->
			<view class="goods-info-body">
				<view class="goods-name">{{goods_info.goods_name}}</view>
				<view class="favi">
					<uni-icons type="star" size="18" color="gray"></uni-icons>
					<text>收藏</text>
				</view>
			</view>
			<!-- 运费 -->
			<view class="yf">快递: 免运费</view>
		</view>
		
		<!-- 商品详情信息 -->
		<rich-text :nodes="goods_info.goods_introduce"></rich-text>
	
		<!-- 商品导航组件区域 -->
		<view class="goods_nav">
			<uni-goods-nav :fill="true"  :options="options" :buttonGroup="buttonGroup"  @click="onClick" @buttonClick="buttonClick" />
		</view>

	</view>
</template>

<script>
	// 从 vuex 中按需导出 mapState 辅助方法
	import { mapState, mapMutations, mapGetters } from 'vuex'
	
	export default {
		data() {
			return {
				goods_info: {},
				
				// 左侧按钮组的配置对象
				options: [{
				   icon: 'shop',
				   text: '店铺'
				}, {
				   icon: 'cart',
				   text: '购物车',
				   info: 0
				}],
				// 右侧按钮组的配置对象
				buttonGroup: [{
					text: '加入购物车',
					backgroundColor: '#ff0000',
					color: '#fff'
				  },
				  {
					text: '立即购买',
					backgroundColor: '#ffa200',
					color: '#fff'
				  }
				]
			};
		},
		onLoad(options) {
			const goods_id = options.goods_id
			this.getGoodsDetail(goods_id)
		},
		methods: {
			// 把 m_cart 模块中的 addToCart 方法映射到当前页面使用
			...mapMutations('m_cart',['addToCart']),
			
			async getGoodsDetail(goods_id) {
				const {data: res} = await uni.$http.get('/api/public/v1/goods/detail',{goods_id})
				if(res.meta.status !== 200) return uni.$showMsg()
				
				// 使用字符串的 replace() 方法，为 img 标签添加行内 style 样式，从而解决图片底部空白间隙的问题
				res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display:block;" ').replace(/webp/g, 'jpg')
				this.goods_info = res.message
			},
			// 实现轮播图的预览效果
			preview(i) {
				uni.previewImage({
					// 预览时，默认图片的索引
					current: i,
					// 遍历 pics，获取所有图片的 url 地址的数组
					urls: this.goods_info.pics.map(x => x.pics_big)
				})
			},
			onClick(e) {
				if(e.content.text === '购物车') {
					uni.switchTab({
						url: '/pages/cart/cart'
					})
				}
			},
			buttonClick(e) {
				if (e.content.text === '加入购物车') {
					
					const goods = {
						goods_id: this.goods_info.goods_id,       //商品的Id
						goods_name: this.goods_info.goods_name,   //商品的名称
						goods_price: this.goods_info.goods_price, //商品的价格
						goods_count: 1,							  //商品的数量
						goods_small_logo: this.goods_info.goods_small_logo,  //商品的图片
						goods_state: true						  //商品的勾选状态
					}
					
					this.addToCart(goods)
				}
			}
		},
		computed: {
			// 把 m_cart 模块中名称为 total 的 getter 映射到当前页面使用
			...mapGetters('m_cart',['total']),
		},
		watch: {
			// 定义 total 侦听器，指向一个配置对象
			total: {			
				handler(newVal) {
					const findResult = this.options.find(x => x.text === '购物车')				
					if(findResult) {
						findResult.info = newVal
					}
				},
				// immediate 属性用来声明此侦听器，是否在页面初次加载完毕后立即调用
				immediate: true
			}			
		}
	}
</script>

<style lang="scss">
	swiper {
		height: 750rpx;
		
		image {
			width: 100%;
			height: 100%;
		}
	}
	
	.goods-info-box {
		padding: 10px;
		padding-right: 0;
		.price {
			color: #C00000;
			font-size: 18px;
			margin: 10px 0;
		}
		
		.goods-info-body {
			display: flex;
			justify-content: space-between;
			
			.goods-name {
				font-size: 13px;
				padding-right: 10px;
			}
			
			.favi {
				width: 120px;
				font-size: 12px;
				display: flex;
				flex-direction: column;
				justify-content: center;
				align-items: center;
				border-left: 1px solid #efefef;
				color: gray;
			}
		}
		
		.yf {
			margin: 10px 0;
			font-size: 12px;
			color: gray;
		}
	}
	
	.goods_nav {
		position: fixed;
		bottom: 0;
		left: 0;
		width: 100%;
	}
	
	.goods-detail-container {
		padding-bottom: 50px;
	}
</style>
